* coveralls need to be run from a git checkout
* needs setup.cfg to be copied to the test folder in order to have
nosetests running with the right arguments
* moved after_success step to a script on its own
* some clean-up in particular to have environment variable defined in
.travis.yml as much as possible
In the travis UI, the output of the build step (from
continuous_integration/install.sh) is folded away when the that step
suceed making it easier to focus on the actual test outcome.
Loïc Estève